package com.example.educenter.controller;


import com.example.educenter.entity.UcenterMember;
import com.example.educenter.service.UcenterMemberService;
import com.example.educenter.utils.ConstantWxUtils;
import com.example.educenter.utils.HttpClientUtils;
import com.example.handler.GuliException;
import com.example.utils.JwtUtils;
import com.google.gson.Gson;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.HashMap;

//@CrossOrigin
@Controller       //请求地址
@RequestMapping("/api/ucenter/wx")
public class WxApiController {

    @Autowired
    private UcenterMemberService memberService;

    @GetMapping("/callback")
    public  String callback(String code,String state){

        try {
            //1.获取code值，临时票据，类似验证码

            //2、拿着code请求 微信的固定地址，得到两个值access_token和openid
            String baseAccessTokenUrl = "https://api.weixin.qq.com/sns/oauth2/access_token" +
                    "?appid=%s" +
                    "&secret=%s" +
                    "&code=%s" +
                    "&grant_type=authorization_code";

            //P拼接三个参数： id  秘钥和code值
            String accessTokenUrl = String.format(
                    baseAccessTokenUrl,
                    ConstantWxUtils.WX_OPEN_APP_ID,
                    ConstantWxUtils.WX_OPEN_APP_SECRET,
                    code
            );
            //请求这个拼接好的地址，得到这两个值， access_token和openid
            //使用http发送请求，得到返回结果

            String accessTokenInfo = HttpClientUtils.get(accessTokenUrl);

            //使用json转换工具gson
            Gson gson=new Gson();
            HashMap mapaccessToken = gson.fromJson(accessTokenInfo, HashMap.class);
            String accessToken = (String) mapaccessToken.get("access_token");
            String openid = (String) mapaccessToken.get("openid");



            //把扫描人信息添加到数据库里面
            //判断数据库里面是否存在相同微信信息,根据openid判断

          UcenterMember member=memberService.getOpenIdMember(openid);
          if(member==null){
              //member是空，表里里面没有相同的数据,进行添加
              //3  拿着得到accesstoken和openid，再去请求微信提供固定的地址，获取到扫描人信息
              String baseUserInfoUrl = "https://api.weixin.qq.com/sns/userinfo" +
                      "?access_token=%s" +
                      "&openid=%s";

              //拼接两个参数
              String userInfoUrl = String.format(
                      baseUserInfoUrl,
                      accessToken,
                      openid
              );

              //发送请求
              String userInfo = HttpClientUtils.get(userInfoUrl);

              //获取返回userinfo字符串扫描人信息
              HashMap userInfomap = gson.fromJson(userInfo, HashMap.class);
              String nickname = (String) userInfomap.get("nickname");
              String headimgurl = (String) userInfomap.get("headimgurl");

              member=new UcenterMember();
              member.setOpenid(openid);
              member.setNickname(nickname);
              member.setAvatar(headimgurl);
              memberService.save(member);
          }
          //使用jwt根据member对象生成token字符串
            String jwtToken = JwtUtils.getJwtToken(member.getId(), member.getNickname());

            //最后  返回首页面，通过路径传递token字符串
            return  "redirect:http://localhost:3000?token="+jwtToken;

        } catch (Exception e) {
            e.printStackTrace();

            throw  new GuliException(20001,"登录失败");
        }


    }


    //生成微信扫描二维码
    @GetMapping("/login")
    public  String getWxCode(){

//        String url="https://open.weixin.qq.com/connect/qrconnect?";
        //1 获取code值，临时票据，类似于验证码
        //2 拿着code请求 微信固定的地址，得到两个值 accsess_token 和 openid
        // 微信开放平台授权baseUrl
        String baseUrl = "https://open.weixin.qq.com/connect/qrconnect" +
                "?appid=%s" +
                "&redirect_uri=%s" +
                "&response_type=code" +
                "&scope=snsapi_login" +
                "&state=%s" +
                "#wechat_redirect";
        //对redirect_url进行urlencoder编码
        String  redirectUrl=ConstantWxUtils.WX_OPEN_REDIRECT_URL;
        try {
            URLEncoder.encode(redirectUrl,"utf-8");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }

        //设置%s里面的值
        String url= String.format(
                baseUrl,
                ConstantWxUtils.WX_OPEN_APP_ID,
                ConstantWxUtils.WX_OPEN_REDIRECT_URL,
                "atguigu"

        );


        //重定向到请求微信地址
        return "redirect:"+url;
    }

}
